Module 2 – Foundations of physics

Percentage differencePercentage difference

You may be asked to determine the percentage difference between experimental values and accepted values. ‘Experimental values’ are those that are derived from measurement or calculation, whereas ‘accepted’ or ‘theoretical’ values are values that are accepted by the...

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Scalars and VectorsScalars and Vectors

A Scalar quantity is a quantity which only has magnitude. Some examples of Scalar quantities are: o Mass o Time o Temperature o Length o Speed o Energy >A Vector quantity is a quantity that has both magnitude and direction. Some examples of Vector quantities are: o...

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UncertaintiesUncertainties

Absolute Uncertainties: The absolute uncertainty (usually called absolute error - but "error" connotes "mistake", and these are NOT mistakes) is the size of the range of values in which the "true value" of the measurement probably lies >If single readings have been...

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Physical QuantitiesPhysical Quantities

Physical quantities have a numerical value and a unit. These are physical quantities that can be quantified: Examples are o Mass o Length o Temperature o Time  Estimates of physical units can be made.

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Measurements and Uncertainties

Accuracy: An experiment is accurate if the quantity being measured has a value that’s very close to the commonly accepted or true value. For example an experimental value for the acceleration of free fall of 9.78 m s-2 is much more accurate than an experimental value...

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